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Re: Stupid question (response) (archive)

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Posted by Concerned on April 23, 1999 at 17:27:41:

In Reply to: Stupid question (more) posted by Yella on April 23, 1999 at 13:03:33:

: This is a stupid question, but let me ask anyway. Maybe people with more miles on their M3s can answer this.

: Since all the ramps to freeways and exits from freeways are to the right(atleast in Nor Cal), does it put more stress on one side of the suspension that the other. How about the tires? I drive pretty aggresively on the ramps and exits. Does this have any long term effects? I wish there are some left turn ramps and exits, so that I can be a better driver. Here in SF bay area we have a lot of loops which makes driving my 99M3 a lot of fun.

: Thanks,

: -Yella
: 99M3/2 Estoril blau/black

You are correct! The suspension and tires (on the outside of turn) will take more stress and therefore prematurely wear faster than on the inside components. As a precautionary preventive maintenance measure, these components should be replaced at a greater frequency based on the ratio of the overall left/right turns. For example, if you have 2 times as many right turns as left turns (say year avg. 16,000 right/8,000 left = 2.0), you should replace the affected components at half of the projected life of that individual component.

Recommendation: Since you are an aggesive driver, rear tires will last 12,00 miles, fronts longer. Considering the ratio of left/right turns, as a precationary measure (do to internal invisible stresses), you should replace your outside rear tires at 6,000 miles and fronts at 10,000. Insides F/R at 12,000/20,000 miles respectively. Of course this is based on the above example, you must count up your total number of turns L/R and calculate your own ratio and apply accordingly. Oh don't forget the shocks/springs/bushing and other suspension components must be replaced at differenct times as well (this is even more important since there is no visible signs of wear). Based on this example, you should replace all the outside turn components at say 25,000 miles to be on the safe side.

You hit on a very important and highly overlooked topic, but following these measures will give you many-many safe and enjoyable motoring years.

Hope this information helps and as usually you should probably discuss this topic with your dealer, so you don't void your warrenty. The manufacturer does not like an excessive L/R turn ratio without preventive component replacement measures.

Remember, there is no such thing as stupid questions only stupid answers where appropriate.

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